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Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 22,658 | $ 28,380 | $ 31,679
State |  |  |  |  |  |  |  |  | 2,625 | 1,354 | 2,131
Total |  |  |  |  |  |  |  |  | 25,283 | 29,734 | 33,810
Deferred |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 13,369 | 22,314 | 10,480
State |  |  |  |  |  |  |  |  | 3,075 | 1,147 | 557
Revaluation of net deferred tax assets as a result of the Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  | 0 | 14,486 | 0
Total |  |  |  |  |  |  |  |  | 16,444 | 37,947 | 11,037
Total income tax expense | $ 13,098 | $ 8,532 | $ 10,424 | $ 9,673 | $ 30,234 | $ 14,199 | $ 11,993 | $ 11,255 | $ 41,727 | $ 67,681 | $ 44,847

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